Re: [w3c/manifest] Add support for defining a theme color for both light & dark modes (prefers color scheme) (#975)

> FWIW, I think the prefers-language/prefers-languages media feature is interesting. I do wonder what use case(s) it has, however. 

I was thinking: 

1. User browses the app in English and does not log in. For privacy reasons, the UA lies to the web page about the `Accept-Language` (always "en-US"). 
1. User decides to installs the app. 
1. The install prompt is presented and it is localized to match the actual OS preferred language.

> It seems like the Accept-Language header is a much more valuable signal and would allow for better performance through server-side negotiation rather than handling things at the layout & rendering layer.

Right, but this signal is for use outside of the browsing context. Like with changing icons based on `prefers-color-scheme` and icons, it might also change dynamically if the user changes their OS (or app) language from system preferences.



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